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Cam Salzberger

MathWorks

Last seen: Today Active since 2015

I am a Software Engineer at MathWorks, and a Mechanical Engineer by education. I specialize in Robotics.

In my free time, I enjoy hiking and parkour.

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Answered
Received just one message when I used receive(sub, timeout) for rossubscriber
The receive function will only ever receive a single message, and returns immediately upon receiving that message. It is not a r...

12 days ago | 0

| accepted

Answered
convert BGRA8 image format to RGB format
Since the image data is coming out of a ROS message, you can use the ROS functions to extract the image from it: Message object...

12 days ago | 0

Answered
ROS - rosgenmsg: "The folder path, gradle-1.8, is invalid or the folder does not exist." R2018a - Linux
Edit: Moving this to an answer instead of comment. Hello Guillermo, In R2020a and prior releases, there are different instruct...

27 days ago | 0

Answered
Long delay calling ROS service
Hello Bryce, I wasn't able to reproduce this on my machine with R2021a and the standard Melodic VM. I tested with both the PR2 ...

28 days ago | 0

Answered
How to get an array from a Rosbag
I provided some guidance and sample code to a similar question here. That should help get you moving in the right direction! -C...

1 month ago | 0

Solved


The Piggy Bank Problem
Given a cylindrical piggy bank with radius g and height y, return the bank's volume. [ g is first input argument.] Bonus though...

1 month ago

Answered
Finding value pairs in subsequent arrays
Hello Kai, If the order doesn't matter (i.e. the "call" doesn't need to be before the "put"), you could separate out the data i...

1 month ago | 0

| accepted

Answered
When can ROS actions be supported during the custom message generation?
I provided some information on why this is the case here. There is no workaround for manually generating custom actions in R2021...

2 months ago | 0

| accepted

Answered
How to pick the content out of a ROS Point message?
Hello Andreas, cellfun is useful for operations like this, where you want to do the same thing on each cell. Probably the best ...

2 months ago | 1

| accepted

Answered
what's TruckTrailerPlot function?
That example is in the Model Predictive Control Toolbox. Do you have that one? -Cam

2 months ago | 0

Answered
MATLAB crashes after running ros2bag
Hello Nurullah, /opt/ros/foxy/lib/librosbag2_storage_default_plugins.so This indicates it's using your ROS 2 Foxy library on y...

2 months ago | 1

| accepted

Answered
Creating custom ROS2 Message in Simulink using ROS2 Foxy
Hello Harun, My money would be on this specific issue being cause by AMENT_PREFIX_PATH being checked for include files during t...

3 months ago | 1

| accepted

Answered
If you're using tic, toc, and var=input('prompt'), is there a way for toc to interrupt the user input if they take too long to answer?
Hello Christina, You could try using an inputdlg to ask the question, instead of keeping it in the command window. You could ge...

3 months ago | 0

| accepted

Answered
How to launch RVIZ from Matlab?
Hello Andreas, My suspicion of what is happening here is library path conflict. ROS Toolbox ships with ROS libraries, which pro...

3 months ago | 0

| accepted

Answered
Add option to select networkinterface for libwmros2server
Hello Andrei, ROS 2 itself doesn't currently provide an easy way to select a particular network interface to use (like an envir...

3 months ago | 1

Answered
Why do I receive: Error using ros.internal.ROSProjectBuilder/buildPackage (line 534) Error building package: build log.
The key part of the error message in the log file is right here: Path: <...> exceeds the OS max path limit. The fully qualified...

3 months ago | 0

| accepted

Answered
ROS Subscriber in Simulink does not seem to receive data
Hello Angel, This is likely to be caused by the publisher on the ROS machine not having the ROS_IP environment variable set or ...

3 months ago | 0

Answered
Cannot echo messages coming from Matlab ROS2
Hello Sergei, Please see this answer for up-to-date information on the Dashing-Foxy connectivity issue, and workarounds. -Cam

3 months ago | 1

| accepted

Answered
How can I update a dependent property
Hello Amine, Dependent properties aren't just initially calculated based on other properties, they are always calculated using ...

4 months ago | 0

Answered
how to fix ode45 parameters?
The value of "y" (the "state" input to "derivative") is going infinite or NaN at some point. I'd suggest creating a helper funct...

4 months ago | 0

Answered
How can I set the labels of multiple axes without iteration?
Hello Yazan, If, as you create the axes, you save the handles to one reference axes array, you can easily set the labels like s...

4 months ago | 0

| accepted

Answered
Problems with ROS service client in MATLAB
Hello Massimo, I attempted to reproduce this by taking this mavros_msgs/CommandTOL service defintiion. Fortunately it doesn't e...

5 months ago | 0

Answered
Niryo One - MATLA interface
Hello Afsoon, Can you try running this code in MATLAB: !cmake --version If you see any warning messages about libcurl or libs...

6 months ago | 0

| accepted

Answered
How can ROS Custom Messages be exchanged or even moved to another folder?
Hello Sven, The "addpath" command is only a small part of getting the custom messages working with MATLAB. It is required to re...

6 months ago | 0

| accepted

Answered
Lidar Labeler Rosbag Loading Error (Ubuntu 20.04): Could not locate the base directory for ros.
Hello Daniel, Does the error occur if you try to load the rosbag data outside of the Lidar Labeler? bag = rosbag(filePath); m...

7 months ago | 1

| accepted

Answered
Leader following robot?
Hello Dominika, We have a similar example that demonstrates a robot (either real or simulated in Gazebo) following an object. I...

7 months ago | 0

| accepted

Answered
Generating ROS Custom Action Service Messages in R2021a
Hello Wesley, In R2020a and before, custom actions were not officially supported for ROS Toolbox. It's noted in the documentati...

7 months ago | 0

| accepted

Answered
MATLAB ros 3D visualizing in real time
Hello Eirik, You can create a ROS subscriber for the PointCloud2 topic, and in the callback have it update a scatter3 plot show...

8 months ago | 0

Answered
Receive data from ros2 /scan topic does not work, while it is possible for /odom and /cmd_vel topic
Hello Bernd, There are two main culprits that I always look at first when there is difficulty communicating in ROS 2, but there...

8 months ago | 0

| accepted

Answered
Generate custom ROS messages in Matlab running on Windows using Cmake from Ubuntu install on WSL2
Hello Eric, You will need CMake installed on your Windows system, along with Visual Studio 2017 and Python 2.7. It's unlikely t...

8 months ago | 1

| accepted

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